On Monday the group put down about $2 million for a slate of television commercials through next Monday, the day before the presidential election.

The move prompted the Obama campaign to shift advertising resources there for the first time since July. It announced on Monday that it too would being airing commercials in the state.

The Restore Our Future purchase includes about $1.2 million in the voter-rich Philadelphia media market where Republicans believe they can make inroads with a number of different demographics, including Jewish voters who may be open the arguments put forward by the Romney campaign that Mr. Obama has not been supportive enough of Israel. Republicans have sought to drive distance between Mr. Obama and his Jewish constituency because of the recent tension between the United States and Israel over Iran.

Another group that has been advertising there is the Republican Jewish Coalition, which is airing an ad that features the founder of Home Depot, Bernie Marcus, criticizing Mr. Obama's economic leadership. And Americans for Job Security, another conservative super-PAC, is also going up with a new Pennsylvania ad campaign.

To be sure, Restore Our Future has been making some of the more long-shot bets in recent weeks. It continues to have a strong presence on the air in Michigan, which has been strongly leaning toward Mr. Obama in many recent polls. But the group also placed what ended up being a smart -- and seemingly long-shot -- bet on Wisconsin earlier this fall when few others were willing to devote resources there.

Now many polls show Wisconsin, home of the Republican vice-presidential nominee Paul D. Ryan, to be competitive.